In chapter 10 of Alas Babylon, how do randy and dan differ in what they see as the greatest threat to their survival?

Chapter Ten brings grim news to the Bragg family home. 
Dan Gunn has discovered two terrible issues facing Fort Repose: 1) a case of typhoid
fever at the Sunsbury family, and 2)highwaymen preying on travelers on the River Road. 
Both Dan and Randy have differing opinions about which is the more urgent issue.  Dan
fears an epidemic break-out of typhoid fever which could wipe out a huge chunk of the
population in the future; meanwhile Randy fears the here and now and the possibility of
those highwaymen targeting more innocent families and travelers.  Randy
argues:

"All
I can do about the typhoid is warn people, which you have done already and which I will
do again.  I can't shoot a germ.  I'm concerned with the highwaymen right now, this
minute.  Next, they'll start raiding the houses (248). 

Randy takes action and
organizes a carefully thought out strike against the highwaymen.  In the ambush, he also
hopes to find Dan's missing doctor bag with its immunizations in it to address the
doctor's concerns as well.  Unfortunately, he does not find the bag, but the hanging in
Marines Park sends a clear message to the remaining highwaymen.